Thread:KirLudwig/@comment-34757010-20180405212505/@comment-26930508-20180406072538

You can go check on the wiki the rarity of the pokemon you want to know are common or rare shinies.

For example, if you want to know if the shiny poliwag (just an example) is  rare, go to the page on the wiki of the place where it can be found and check its rarity.